TSN says Nascar should be available.
https://channelstore.roku.com/en-ca/details/772d42e6cb612f822634c1eca1ef1384/tsn
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If you have a subscription to TSN, try going to their website and see if you can cast to your Roku device. https://www.tsn.ca. Under the Watch Live section, supposed to be showing the Daytona 500 today. https://www.tsn.ca/live
If nothing else, you could always connect a laptop to the TV via HDMI, or load it on a mobile device and cast it through the Roku.
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Really going to have to contact the developers of the TSN channel/app and see what is going on if you do not see the Nascar offerings on your Roku. https://www.tsn.ca/help/contact-us
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
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